cant get a good plug read

[Goob]

have a 09 400x full hmf k&n filter and sparks timing key i have been running a 155 and though it ran well but since its been colder it pops on decel more so i added a 160 main but if im reading right it looks very lean my elevation is 499ft and it isnt that cold 30s or 40s and getting warmer

[Goob]

that is the new plug this is the one before

[honda400ex2003]

popping on decel is a lean pilot circuit not a lean main circuit. you would have to turn your f/a screw out 1/2 turn at a time till it goes away. it is probably a good idea to run the 160 anyway for the winter also. both plugs look fine though. lean the 155 in for the summer and keep the 160 for the winter jet.


steve

[honda400ex2003]

also the white tip will go away after you richen the pilot up. that is what causes that problem. you will be good to go once you get the pilot back in order.

steve

[Goob]

k i may mess with the a/f screw a little its not popping just a whole lot thanks

[Goob]

k i may mess with the a/f screw a little its not popping just a whole lot thanks

[honda400ex2003]

go 1/2 turn then and you will be fine till spring esp with the 42 in there. you probably wouldnt even have to go 1/2 turn but then you wont have to do it again. just keep turning it out till it goes away.


steve

[jake"08"400]

Hey man what elavation are you at?

[jake"08"400]

Nevermind I just saw it. Cos I'm running a slip on hmf with a 158 main and I'm at 800 feet.

[Goob]

From what I have looked up on the Internet 499 to 525 above sea level

[Goob]

Does higher elevation mean smaller or larger jet size

[jake"08"400]

I think for lower elavation its a bigger jet and higher elavation smaller jet.

[honda400ex2003]

correct bigger for lower or colder temps. he would be fine with a 158 main but since he has the 160 in there he might as well leave it till spring rolls back around. 1 jet size isnt going to make or break it lol. better rich than lean anyway. we got jakes dialed last week for peak running with his setup. steve

[jake"08"400]

And I thank y'all for all the help. Had an idea of what to do but steve and flipper helped a lot and the other guys with jetting help threads lol. But thank y'all

[Goob]

K thanks guys I was wondering if I removed my airbox lid would I be able to tell that much of a difference

[jake"08"400]

I don't know bout removing the airbox thought bout doing that this summer to mine cause I'm pretty sure that 158 will be rich by then. But I do got holes in my air lid and it deffintly gets more air you can feel it sucking air threw them.

[honda400ex2003]

i would say not to for now, like jake said, maybe for the summer since you will have your jetting close for no lid by then.

steve

[Goob]

K I was just goin to remove the lid cause I'm I'm sure I'll go back down to a 155 when it warms up And was thinking I could leave in the 160 or 158 with the lid off and I heard it helped a lot

[honda400ex2003]

take it off for the summer and you will be good to go. you could also pull the choke guts out for the summer and you will have a nice gain in throttle response.

steve

[Goob]

I removed the choke when I first jetted is that what your talkin bout

[jake"08"400]

How does it do cranking wise without the choke? With the cold weather. Thought bout taken mine out but just curouis bout how hard starting is.

[Goob]

With the 42 pilot it starts right up without any problem at all don't even have to pump the throttle

[jake"08"400]

Alright man just wondering I usually don't use my choke since I got the 42 but I was worried when it was really cold how it go lol .

[honda400ex2003]

yup :D steve

[Goob]

hey guys went to start the 400 up today and and wouldnt crank so i pulled the plug and it was black looked like a picutre i saw of wet and dry fouling it i rode yesterday and didnt have a problem what could cause this

[jake"08"400]

Did it crank with a new plug. If not check the simple stuff first like the kill switch and make sure you cut your gas back on (if you cut it off after ever ride). But as far as it being black and wet its getting to much gas some how wether its when its running are the carburator may not be completey shutting when you cut it off and leaking into the motor. But check simple stuff first.lol trust me I've cranked on mine for 10 mins just to find out my kill switch was on.

[Goob]

fired right up after the new plug i pulled the plug last night to check and see how it looked really just because i was bored and it got a lot warmer outside yesterday around 60 and i was goin to see if it richened it up any the plug was a little darker than it was but nothin what it is now

[jake"08"400]

So it got worse over night while you wasn't riden it?
Do you cut your gas off at night are when you put it up.
Have ya checked all your tubes to make sure they are not stopped up. Espically the one that runs between your rear shock and swing arm.
Also what jet and pilot do you got it. But if its getting worse over night while your not riden then it has to be the carb not closing all the way are somethings stopped up and causing gas to run constantly wile your not riden. Try and search around on here and see what over peoples problems that have had this happen. But if your not cutting your gas off at night that could be it. But I'm not 100% sure tho.

[Goob]

it could have turned more black while i was tryin to start it im gonna ride aroun close a little while and see how it does

[jake"08"400]

Ok man let me know how it goes and I'll help ya as much as I can. But you never said what jets you got and is your airbox lid take it off and see how it does it being 60 degrees around here in are lower states it may be to rich.

[Goob]

O ok sorry I have 42pilot had 160 main then went to a 158 I may go back down to a 155 that's what I ran all last year

[jake"08"400]

No need for the sorry. I personally would leave the 158 in man cos with a full system I don't see how you wouldn't need it. I'm running a 158 in mine probably needs a 155 and that's with just a slip on and a k&n filter and a couple of holes drilled in my air box.(maybe the holes are maken the differnce) I'm 2 are 300 feet above you in elavation and are summers are pretty hot around here. But if it ran good with a 155 then run it but like steve said one size bigger want hurt and may help in the winter.

[Goob]

K I didn't know if the 160 was to rich or not because I have never fouled a plug like that and rode it through about a tank and half of gas an that's how it was this morning but after I changed plugs it's running fine

[jake"08"400]

Also have you done any real plug chops.

[jake"08"400]

But let me know how it does with the 158.

[Goob]

im gonna try to do a plug chop tonight it seems to be running fine but with the lid off it kinda feels like it dont really top outt but doesnt cut out or anything may just be the sound throwing me off without the lid i usually ride with it on anyways but im thinking abouordering some more jets and start high and go down until it stops cuttin out

[jake"08"400]

I checked my plug today haven't looked at it since I swapped over to a 158 main. Mine looks identical to your first picture, just my tip is brown color not white. What do you have your a/f screw on. Mines 2 1/2 out.

[jake"08"400]

I checked my plug today haven't looked at it since I swapped over to a 158 main. Mine looks identical to your first picture, just my tip is brown color not white. What do you have your a/f screw on. Mines 2 1/2 out.

[Goob]

its 2.5 turns out its not white anymore though it looks fine now it actually runs better with the 155 main i put in today

[jake"08"400]

Good to here man. I guess the uni filter elements really do help then lol.

[Goob]

hey i was on an hmf forum and aske a guy that works there what he would recommend for me and he said lid on a 152 and lid off a 180 and it would be close how come what they suggest is lower than most on here

[jake"08"400]

No idea but a 180 with just a full hmf and airfilter is crazy even if the lid is off. Some guys are most with bore kits and exhaust ant running but 170 are a little better. If it does good with your 155 keep it go out a lil on your a/f screw and I think you'd be good but that's my 2cents and its prolly more like 1 cent lol. Do a good plug chop and see how it looks.

[Goob]

K I just got though adjusting the screw kind of a pain to do it while it's runnin but I think it's pretty close with it being I think it runs better with 158 160 and 150 when it's warm so I'm just gonna leave it at thAt lol I just want to be perfect but that has to be close so I'm gonna stop worrying about it thanks for all the help

[jake"08"400]

No problem man just happy I could help. But rember its always better to be a tad rich than lean.